| Value |
Category |
| 1 |
Per single trip |
| 2 |
Per return trip |
| 3 |
Per week |
| 4 |
Per month |
| 5 |
Do not know |
| 8 |
Not applicable |
| 9 |
Unspecified |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
